1. Endangered ecosystems: a review of the conservation status of tropical Asian rivers

   • David Dudgeon

   OriginalPaper Pages: 167 - 191

2. The life history and biology of Diceratocephala boschmai (Platyhelminthes; Temnocephalida), an ectosymbiont on the redclaw crayfish Cherax quadricarinatus

   • Timothy C. Jones
   • Robert J. G. Lester

   OriginalPaper Pages: 193 - 199

3. Dytiscus latissimus and D. circumcinctus (Coleoptera, Dytiscidae) larvae as predators on three case-making caddis larvae

   • Anita Johansson
   • Anders N. Nilsson

   OriginalPaper Pages: 201 - 213

4. Effects of clay discharges on streams

   • Robert J. Davies-Colley
   • Christopher W. Hickey
   • Paddy A. Ryan

   OriginalPaper Pages: 215 - 234

5. Effects of clay discharges on streams

   • John M. Quinn
   • Robert J. Davies-Colley
   • Paddy A. Ryan

   OriginalPaper Pages: 235 - 247

6. The effect of tubificid oligochaetes on the uptake of zinc by Lake Erie sediments

   • Frederick M. Soster
   • David T. Harvey
   • Travis Grooms

   OriginalPaper Pages: 249 - 258

7. Volume 248 (1992), author index

   Legacy Pages: 259 - 259

8. Volume 248 (1992), contents

   Legacy Pages: i - i